Alexander Pockes authored Dec 19, 2016 and Michael Schanz committed Mar 15, 2017

Based on the results of Alexander Schuller's Bachelor Thesis (i.mx6 quickboot)

Overview
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A standard u-boot build consists of two image files: uboot.img and SPL.
The bootrom is loading the SPL image which performs some basic/initial
configuraion tasks. Afterwards, SPL loads the uboot.img which loads device-tree
and kernel image files.
Falcon mode means, enabling SPL to load/execute the kernel image directly.
This accelerates boot time but requires special u-boot configuration as well as
special (u)SD-card/EMMC setup.

congatec's falcon mode implementation enables SPL to...
-> load the kernel image directly from an arbitrary MMC device (uSD, SD, EMMC)
-> select the boot target (uboot.img/kernel) dependent on GPIO-level or
   environment-settings
-> load uboot.img stored at arbitrary MMC device by definition of
   <CONFIG_CGT_FALCON_MODE> and undefining <CONFIG_CGT_FALCON_MODE_OS_BOOT>.
   Please note, the environment has to be stored at SPI-flash.

Notes
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